FKIE_CVE-2023-53496

Vulnerability from fkie_nvd - Published: 2025-10-01 12:15 - Updated: 2025-10-02 19:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/platform/uv: Use alternate source for socket to node data The UV code attempts to build a set of tables to allow it to do bidirectional socket<=>node lookups. But when nr_cpus is set to a smaller number than actually present, the cpu_to_node() mapping information for unused CPUs is not available to build_socket_tables(). This results in skipping some nodes or sockets when creating the tables and leaving some -1's for later code to trip. over, causing oopses. The problem is that the socket<=>node lookups are created by doing a loop over all CPUs, then looking up the CPU's APICID and socket. But if a CPU is not present, there is no way to start this lookup. Instead of looping over all CPUs, take CPUs out of the equation entirely. Loop over all APICIDs which are mapped to a valid NUMA node. Then just extract the socket-id from the APICID. This avoid tripping over disabled CPUs.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d01a0c3046d1545391ef7bb1f114743d00e3793
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5290e88ba2c742ca77c5f5b690e5af549cfd8591
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/platform/uv: Use alternate source for socket to node data\n\nThe UV code attempts to build a set of tables to allow it to do\nbidirectional socket\u003c=\u003enode lookups.\n\nBut when nr_cpus is set to a smaller number than actually present, the\ncpu_to_node() mapping information for unused CPUs is not available to\nbuild_socket_tables(). This results in skipping some nodes or sockets\nwhen creating the tables and leaving some -1\u0027s for later code to trip.\nover, causing oopses.\n\nThe problem is that the socket\u003c=\u003enode lookups are created by doing a\nloop over all CPUs, then looking up the CPU\u0027s APICID and socket. But\nif a CPU is not present, there is no way to start this lookup.\n\nInstead of looping over all CPUs, take CPUs out of the equation\nentirely. Loop over all APICIDs which are mapped to a valid NUMA node.\nThen just extract the socket-id from the APICID.\n\nThis avoid tripping over disabled CPUs."
    }
  ],
  "id": "CVE-2023-53496",
  "lastModified": "2025-10-02T19:12:17.160",
  "metrics": {},
  "published": "2025-10-01T12:15:52.950",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0d01a0c3046d1545391ef7bb1f114743d00e3793"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5290e88ba2c742ca77c5f5b690e5af549cfd8591"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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